my Toyota Corolla E140 (2006-2013) AC blows hot air what could be the issue

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is off.
• Disconnect the battery to ensure safety.

2. Check Refrigerant Level

• Using an AC gauge set, connect the low-pressure and high-pressure hoses to the service ports.
• Start the engine and turn on the AC to check the refrigerant levels.
• If low, evacuate the system and recharge with the appropriate type of refrigerant (usually R-134a).

3. Inspect and Replace AC Compressor

• Remove the serpentine belt by releasing tension with a wrench.
• Disconnect the electrical connector from the AC compressor.
• Remove the bolts securing the compressor to the engine.
• Carefully take out the old compressor and install the new one.
  • Torque specifications for mounting bolts: typically 15-25 ft-lbs.
• Reconnect the electrical connector and install the serpentine belt.

4. Check and Replace AC Clutch Relay

• Locate the AC relay in the fuse box (refer to the owner's manual for location).
• Remove the relay and test it with a multimeter for continuity.
• If faulty, replace it with a new relay.

5. Replace Cabin Air Filter

• Locate the cabin air filter housing (usually behind the glove compartment).
• Remove the glove compartment to access the filter.
• Take out the old filter and install a new one, ensuring correct orientation.